5 The absence of apparent relevance of the documents, production of which is called for by a subpoena or notice to produce, is a sufficient ground to set it, or part of it, aside [Trade Practices Commission v Arnotts Ltd (No 2) (1989) 21 FCR 306; Hatton v Attorney General of the Commonwealth of Australia (2000) 158 FLR 31; 26 Fam LR 520; Portal Software Pty Limited v Bodsworth (2005) NSWSC 1115, [20] - [22]]. In this context, the concept of "apparent relevance" was explained by Beaumont J in Arnotts in terms that the material in question had apparent relevance if it "could possibly throw light on the issues in the main case". Similarly, in Alister v The Queen (1984) 154 CLR 404, Gibbs CJ at 414 accepted the proposition that "a subpoena had a legitimate forensic purpose if it appeared to be 'on the cards' that the documents sought would materially assist the defence in a criminal proceeding". Accordingly, documents called for by a subpoena will not lack apparent relevance sufficient to justify the issue of the subpoena if they could possibly throw light on the issues in the substantive proceedings or if it appears to be on the cards that they will do so. In some respects, what is of apparent relevance in the context of a subpoena or notice to produce is wider than in the context of discovery, including because, in the case of a subpoena or notice to produce, unlike discovery, documents arguably capable of providing a legitimate basis for cross-examination on credit have sufficient relevance [Brand v Digi-Tech (Australia) Limited (2001) NSWSC 425 (Hunter J), [36]].